This Hyper Tough 10-Piece Masonry drill bit set is used for drilling concrete, brick, block and masonry. Great tools for drilling holes. Triangle shape shank helps hold the bit securely. This 10 piece set delivers superior quality in a range of the most useful bits needed for at home or on the jobsite. These sizes consist of the following (2) 1/8" with round shank; (2) 5/32" with triangle shank; (2) 3/16" with triangle shank; 1/4" with triangle shank; 5/16" with triangle shank; 3/8" with triangle shank; 1/2" with triangle shank. These masonry drill bits were designed for use with drills and hammer drills and have super hard carbide tips for blasting through concrete, tile and masonry. When you are ready to tackle that home project Hyper Tough is ready!